OK...so it sounds like your tank hasn't actually cycled the whole time you have been running it, if you have been adding chlorinated water every water change. No wonder you are having problems.
You definitely need to add water conditioner (de-chlorinator). Otherwise you are killing your filter bacteria each water change and your tank will be all over the place.
You certainly have perseverance, but maybe you should have another look at the basic guidelines for running a tank again as a refresher?